Experience by Plundering

In my most recent post I touched on a number of unusual methods in which the dungeon itself figures into the rules of advancement for my latest project, the Bleak Beyond. I received plenty of thoughts and feedback on the Accomplishments portion of that post, but I am wondering how readers feel about the fact that I am considering expunging the tried and true notion of Experience Points in favor of the proposed Experience by Plundering approach:

Experience by Plundering

Characters gain one experience level whenever they are a member of an expedition which makes off with a Treasure Trove, by successfully returning with it to town, providing the loot was plundered from a dungeon level which is of equal or greater value than the character's own current level.

For more specifics you can read the previous post below this one. There are, as mentioned within that post, other criteria which must be met in order to advance to level 12.

Thanks to the feedback from last week's post I will be redesigning some of the Accomplishments in order to right the wrongs indicated by reader -C and taking a less heavy handed technique in order to allow more freedom of choice by the players. In other words, more interaction with the dungeon itself and a little less with the dwellers within.

Thoughts, Ideas and Suggestions on Experience by Plundering?

~Sham